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Web Sensor H5521 - remote CO2 concentration with Ethernet interface, embedded webserver and two relays

Web Sensor H5521 - remote CO2 concentration with Ethernet interface, embedded webserver and two relays
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859,20 EUR

20 % VAT incl. excl. Shipping costs

Shipping time: 3-4 Days

Product no.: H5521
Web Sensor H5521 - remote CO2 concentration with Ethernet interface, embedded webserver and two relays



Building management

The CO2 - carbon dioxide level is recently regarded as an important parameter that substantially determines the quality of the interior climate. Especially in buildings where many people gather, such meeting rooms, hospitals, schools, cinemas, theatres and care centres. With the help of CO2 sensor engineers, technical advisors, environmental experts and health specialists can optimize the ventilation for creation of a healthy interior climate. 

CO2 monitoring of buildings, history data to Comet Database, remote alarm by email or SMS

CO2 monitoring of storage, history data to Comet Database or 3rd party SCADA system

Factories and manufacturing

CO2 monitoring for food processing industry, pharmaceutical industry, etc.v

CO2 level transmitter with two output relays.

The CO2 measurement is based on a 2-source, 2-beam process. CO2 measurement with long-term stability is guaranteed thanks to the proven non-dispersive infrared (NDIR) CO2 measurement cell. The unique patented auto-calibration procedure compensates for aging of the infrared source and guarantees high reliability, long term stability and eliminates the need of periodical recalibration in the field.

Included in delivery:
  • H5521 sensor
  • Traceable calibration certificate
  • Quick start manual
  • Technical support at discussion forum
 Easy wireless communication using the H5521 Web Sensor and an optional  Wireless router.
Comet Database
Complex solution for data acquisition and analysing. Easy to use and high flexible database software for Comet Transmitters and Regulators.

T-Sensor software
Free configuration utility for Comet Transmitters and Regulators.

SensorReader software
Basic data acquisition utility for Comet Transmitters and Regulators. Software is free for download.

3rd party software
Cacti, InTouch, ControlWeb, EasyView, LabVIEW. Support for this software is provided by the 3rd party companies.




CO2 concentration 

Carbon dioxide sensor

Method of CO2 sensor multipoint calibration leads to anexcellent accuracy measurements of CO2 in the entire ofoperating temperature rangeWith this sensor is the device able to meet the demanding requirements foroutdoor useThe measurement principle is based on the NDIR principle  with dual wavelength, which automaticallycompensates for aging of the sensor. The sensor isresistant against the pollution and provides maintenance-free operation and excellent long-term stability.

History export to CSV

CSVHistory values can be exported for next processing by the CSV file. CSV file can be processed inside spreadsheet application like Microsoft Excel or OpenOffice Calc. Two formats of CSV file are supported - dot and comma decimal point separators. Timestamps inside CSV file are shown when device time is synchronised by the SNTP server. CSV file can be downloaded from web pages or periodically send as email attachment..

ModbusTCP protocol

ModbusModbus protocol for communication with SCADA systems or third party software. Device use Modbus TCP protocol version. Two Modbus clients can be connected to device at one moment.

Dual line LCD


Large dual line LCD for display of CO2 concentration. Display can be switched off.

Ethernet interface

Ethernet10Base-T/100Base-TX Ethernet interface via standard RJ45 connector. IP address can be obtain automatically from DHCP server or set manually. Internet protocol version 4 is supported only.

SNMP protocol

SNMPSNMP version 1 protocol for IT infrastructure. Using SNMP protocol you can read actual measured values, alarm status and alarm parameters. Via SNMP protocol is also possible to get last 1000 measured values from history table. MIB tables with OID description are available.

 WWW server

WWWWWW config

Actual measured values are accessible via powerful embedded web server. Web pages are ready for access from mobile devices like smartphones and tablets. Device configuration via web pages is possible too. The device allows you to user customize the design of web pages.



SNMP Trap for IT infrastructure. The device allows sending Traps to selected Trap receiver server. Traps are sent in case of alarm on channel or at error states like unable to send email, unable to deliver SOAP message, etc.


History values memory

1000 valuesMeasured values are stored into history memory according selected time interval. Capacity of the memory is 1000 records for each channel. Values inside history memory are not backuped. Memory is cleared after device restart.

SOAP Protocol

SOAPThe device allows to send currently measured values via SOAP v1.1 protocol. The device sends values in XML format to the web server. The advantage of this protocol is that communication is initialized by the device side. Due to it is not necessary use port forwarding.

Syslog protocol

SyslogSyslog protocol for IT infrastructure monitoring systems. The device allows sending text message to selected Syslog server. Messages are sent in case of alarm on channel or at error states like unable to send email, unable to deliver SOAP message, etc.

SNTP protocol - time synchronization

SNTPTime synchronisation with SNTP server. Actual time is shown at web pages and is necessary for timestamps inside CSV files. Synchronisation interval can be set to one day or to one hour.

History graphs

GraphGraphs with history values are accessible via web pages. Modern HTML5 canvas graphic component allows to use graphs from thousands of devices. It is not problem show graphs on tablets or smartphones. All modern web browsers are supported - Firefox, Opera, Chrome or Internet Explorer 9

 MIN/MAX memory

MIN/MAXMemory for minimum and maximum values. Memory is independent on values in history memory. Minimum and maximum values can be cleared according user requirements.


EmailWarning email are sent when measured value exceed selected limits. Emails are also send when values returns back into safe range. SMTP authentication is supported, but SSL not. Domain name for SMTP server address is supported. Emails with CSV file attachment can be sent at selected intervals.

 Actual values via XML

XMLXML protocol for actual measured values reading. This protocol is suitable for device integration into 3rd party SCADA systems.


Technical parameters Value
Output Ethernet
Measured Value CO2
Construction Type For External Probes
Design Industrial
Temperature Measuring Range to °C
Relay Output Yes
Two-State Input No
Lcd Display Yes
PoE No
Range of CO2 concentration measurement 0 to 10000ppm
Accuracy of CO2 concentration measurement ±(100ppm +5% from reading) at 25°C and 1013hPa
Resolution 1ppm
Measuring interval 15s
Temperature operating range -30 to +60°C
IP protection IP30
Number of relay outputs 2
Maximum switching voltage, current and power of relay output 50V, 2A, 60VA
Audible alarm built-in beeper - switchable
LAN connection RJ-45 connector, 10Base-T or 100Base-TX
Communication protocols WWW, ModbusTCP, SNMPv1, SOAP
Alarm protocols E-mail (SMTP authentication is supported), SNMP Trap, Syslog
Configuration T-Sensor, Telnet, keyboard
Power 9 to 30Vdc, power consumption approximately 1W
Power connector co-axial, diameter 5.5 x 2.1mm
Dimensions 136 x 150 x 45mm (W x H x D)
Weight approximately 320g
Warranty 2 years
Web Sensor H5521 - remote CO2 concentration with Ethernet interface, embedded webserver and two relays


Instruction Manual H5/6_5xx

Instruction Manual H5521

1.97 MB Download
Quick-Start Manual H5/6_5xx

Quick-Start Manual H5521

1.81 MB Download
MIB table H5521

MIB table H5521

431.72 KB Download
Comet WebSensors Catalog

Comet WebSensors Catalog

3.56 MB Download

This Product was added to our catalogue on Thursday 31 March, 2016.

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